We have created a platform on iOS that distributes comprehensive test prep courses.
We are the co-founders of BarMax ("The $1,000 App" -Techcrunch), the only comprehensive bar exam prep course available in the App Store. Our latest product, LSATMax, is now available in the App Store. Download it for free: http://bit.ly/rtzx2k
We are currently developing comprehensive courses for several other standardized tests.